Cavitation and the Flood

The Glen Canyon Dam in 1984 (during floods the following year, but you get the idea)John Morris’ Acts & Facts article for this month is a little different from that of the last two months, in that it doesn’t resemble ‘filler’ quite so much. The piece is called simply Cavitation, and argues that the Grand Canyon could have been formed via this intriguing process.

Cavitation, as Wikipedia informs us,

…is the formation and then immediate implosion of cavities in a liquid – i.e. small liquid-free zones (“bubbles”) – that are the consequence of forces acting upon the liquid.It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities where the pressure is relatively low.

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Permian Pompeii

To begin our week comes Ancient Forest Frozen in Time by Volcano. The geological period is the Permian, the place is Inner Mongolia, and the age is 298 Ma. The paper, Permian vegetational Pompeii from Inner Mongolia and its implications for landscape paleoecology and paleobiogeography of Cathaysia from PNAS, is available as open access here.

Not alot more is left of the trees in this find, one of which may be of a similar variety to this. Continue reading